Manufacturing container or tube from paper; or other manufacturi – Bending – Folding
Reexamination Certificate
2002-03-21
2003-12-09
Kim, Eugene (Department: 3721)
Manufacturing container or tube from paper; or other manufacturi
Bending
Folding
C493S435000, C493S437000, C493S444000
Reexamination Certificate
active
06659931
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATIONS
This application claims priority from Japanese patent application Serial no. 2001-175001 filed Jun. 11, 2001, the contents of which are incorporated by reference herein.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a jaw device for a jaw cylinder provided on the rotary-press folding section that ensures high printing quality by eliminating setoff on the printing surface and contamination on the paper, and preventing signatures, or folded sheets, from coming off from the jaw device.
2. Description of the Related Art
A jaw device for a folding section of a rotary press where a guided continuous paper web is cut to an appropriate length while being wound on the outer periphery of a folding cylinder, and the cut paper sheet guided along the outer periphery of the folding cylinder is caused to protrude into a jaw cylinder provided in contiguity with the folding cylinder by an insertion blade provided on the folding section, and the cut sheet is folded in parallel with the centerline of the folding section by gripping the insertion blade and the paper caused to protrude by the insertion blade is publicly known, as disclosed in Japanese Published Unexamined Patent Application No. Sho-54(1979)-63904 and Japanese Published Unexamined Utility Model Application No. Sho-60(1985)-193365.
Japanese Published Unexamined Patent Application No. Sho-54(1979)-63904 discloses a jaw device comprising a fixed jaw provided on the leading-end side wall edge in the rotational direction on an opening on the outer periphery of the jaw cylinder that is disposed at a location facing an insertion blade of the folding cylinder in the neighborhood thereof, a movable plate that is provided facing the fixed jaw in the opening in such a manner as to be movable between a position at which the paper is gripped and a position at which the paper is not griped so that the paper caused to protrude by the insertion blade can be gripped between the movable plate and the fixed jaw, and a strip made of a rubber elastic material that is provided protruded from a surface of the movable plate on which the paper caused to protrude by the insertion blade and the insertion blade is gripped so that the paper is gripped between the strip and the fixed jaw (herein after referred to as a “first prior art.”)
In the full-text specification of Japanese Unexamined Published Utility Model Application No. Sho-60(1985)-193365, a jaw device comprising a fixed jaw provided at the tip of the rear-side wall in the rotational direction in the opening on the outer periphery of the jaw cylinder that is disposed facing the folding-cylinder insertion blade in the neighborhood thereof, and a movable plate made of a flat plate that is provided facing the fixed jaw in the opening in such a manner as to be movable between a position at which the paper is gripped and a position at which the paper is not gripped so that the paper caused to protrude by the insertion blade can be gripped between the movable plate and the fixed jaw is disclosed (hereinafter referred to as a “second prior art.”)
Furthermore, the full-text specification of Japanese Unexamined Published Utility Model Application No. Sho-60(1985)-193365 discloses a jaw device comprising gripping means having a fixed jaw as shown in the second prior art and a movable plate made of a flat plate, a pin provided passing through the movable plate and facing the fixed jaw for forcing the paper caused to protrude by an insertion blade onto the fixed jaw, in addition to the movable plate, and a leaf spring for transmitting a pushing force to the pin; the insertion blade notched at a position facing the pin (hereinafter referred to as a “third prior art.”)
The jaw device, on the other hand, usually has a recoiling member, such as a spring, on a support member on the side of the movable plate so as to allow for differences in the thickness of the paper gripped by the fixed jaw and the movable plate, and eliminate the loosening of the grip caused by pulling the insertion blade off the jaw device.
In the aforementioned prior-art techniques, the continuous paper web guided by the outer periphery of the folding cylinder in such a manner that the leading end of the web is held by a holding mechanism provided on the folding cylinder, and guided along the outer periphery of the folding cylinder while being wound around the outer periphery of the folding cylinder. Next, the web is cut to predetermined lengths by a cutting mechanism. The cut sheet is then guided along the outer periphery of the folding cylinder, and caused to protrude toward the inside of the jaw cylinder by the insertion blade provided on the folding cylinder while the leading end of the web is released from the held state at an appropriate position.
The protruded insertion blade and the paper are gripped by the fixed jaw and the movable plate in the opening of the jaw cylinder facing the insertion blade.
At this time, the strip made of an elastic material provided on the paper-gripping side surface of the movable plate, in the first prior art, keeps forcing the paper in between the insertion blade and the strip as the strip is compressed by the angular displacement of the movable plate.
Next, the insertion blade of the folding cylinder is extracted from between the fixed jaw and the movable plate, and the cut sheet is folded in parallel with the centerline of the folding cylinder.
When the insertion blade is extracted, a gap is produced between the paper caused to protrude by the insertion blade and located on both sides of the insertion blade. This gap is closed by the repulsive force of the elastic material strip that is compressed to hold down the paper as well as by the action of the repulsive member provided on the side of the movable plate, and the paper is completely gripped by the fixed jaw and the movable plate of the jaw cylinder.
In the second prior art, when the insertion blade and the paper are gripped by the fixed jaw and the movable plate and then the insertion blade is extracted, a gap is produced between the paper protruded by the insertion blade and located on both sides of the insertion blade. This gap is closed by the action of the repulsive member provided on the side of the movable plate, and the paper is tightly gripped by the fixed jaw and the movable plate of the jaw cylinder. Thus, the cut sheet is folded in parallel with the centerline of the folding cylinder.
In the third prior art, the fixed jaw and the movable plate grip the insertion blade and the paper on both sides of the insertion blade, and the paper between the fixed jaw and the movable plate is forced directly onto the fixed jaw with a pin by the repulsive force generated by the deflected leaf spring.
Next, when the insertion blade is extracted, a gap is produced between the paper protruded by the insertion blade and located on both sides of the insertion blade. This gap is closed by the action of the repulsive member provided on the side of the movable plate, and the paper is completely gripped by the fixed jaw and the movable plate of the jaw cylinder. The pin forcing the paper by the repulsive force of the leaf spring forces the paper onto the fixed jaw, and the cut sheet is folded in parallel with the centerline of the folding cylinder.
As described above, the paper folded by the prior-art jaw device then rotates the jaw cylinder as the paper is gripped by the jaw device of the jaw cylinder. The paper is guided along the outer periphery of the jaw cylinder with the rotation of the jaw cylinder, released from the jaw device at an appropriate position, and delivered to the discharge mechanism in the downstream side.
The aforementioned prior-art techniques have several problems to be solved. In the first, second and third prior-art techniques, when the insertion blade causes a cut sheet to protrude in between the fixed jaw and the movable plate of the jaw cylinder, the paper interposed between the fixed jaw and the insertion blade is folded while being ironed by the insertio
Hasegawa Toshio
Nanba Takeo
Uera Yoshinori
Kim Eugene
McGlew and Tuttle , P.C.
Tokyo Kikai Seisakusho Ltd.
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